JPS60207846A - Instantaneous water heater - Google Patents

Abstract

PURPOSE:To obtain a instantaneous water heater with favorable hot water delivery characteristics at low cost by a method wherein the set capacity of a gas burner is corrected based upon the temperature measured by a temperature detector provided in a water passage located in the midway of a heat exchanger. CONSTITUTION:A temperature detector 23 is provided on a water passage 24 located in the midway of a heat exchanger 1. A correcting means 23 calculates the size number Wo based upon the temperature measured after a certain period of time since the start of hot water delivery by the temperature detector 23 so as to substitute the calculated value Wo for the set capacity W and controls a water control valve 9 so as to establish the control water amount Q0. Because the water amount is controlled thenceforth based upon the calculated indication number, the temperature of delivery hot water can be controlled accurately in spite of the occurrence of the fluctuation of inputs or the like. Further, because the temperature detector 23 is located in the midway of the heat exchanger 1, the time required for correction can be shortened, resulting in enabling to deliver the hot water with the set temperature in a very short time.

Description

[Detailed description of the invention] The present invention relates to an instantaneous water heater.

In conventional instantaneous water heaters, there is a system in which a gas proportional valve is controlled in accordance with the above-mentioned temperature difference in order to stabilize the outlet temperature at a set temperature. However, such a gas proportional valve is usually used within a narrowed range of gas pressure, and this method of using an IJ requires consideration of the stable combustion range of the burner, which has the disadvantage that the number control device is expensive. In addition, the gas proportional valve itself is expensive, which poses a problem in terms of product price.
The applicant proposed an instantaneous boiler as shown in FIG. 1 as a method to solve the above problem. To explain such an instantaneous water heater, (]) is a heat exchanger, (2) is a gas burner that heats the heat exchanger (1), and gas bar (2) is a plurality of burner elements (2a), (2b). )j2c), (2d)j2e)
The gas passages (3) leading to these burner elements (2a) to (2e) are branched from the downstream of the original 11tbIi well (4), and each branch gas passage (3a input + 3b bottom 3c
)j3d input (3e) has solenoid valves (5a), (5b), (
5c), (5d), and (5e) are interposed. (6) is a fishery detector provided in the water supply channel (7) leading to the heat exchanger (1), and (8) is a water supply temperature detector. (9) is a water control valve controlled by a controller to be described later. (10) is a hot water tap. (11) is a remote control device installed in a hot water soaking area such as the kitchen, and the remote control device (11) has a capacity setting device (12) for changing the number of combustion gases of the gas parser (2).

A temperature setting device (13) and an operation switch (14) are provided to adjust the humidity of the hot water. (15) is a controller.

Next, the general configuration of the above controller will be explained based on FIG.
6), the feed water temperature (Tw) is detected from the feed water temperature detector (8).
The water flow rate (Q) from the water flow rate detector (6) is determined by the remote controller (1
1), a signal of setting ability and a setting temperature (To) are input. The capacity setting device (12) changes the setting from position (a) to te1.
By switching to the position, the number of combustion elements of the burner element can be reduced to 5.
Switching control is performed from one to one, and at the same time, a signal of the amount of combustion (hereinafter referred to as setting capacity (W)) corresponding to the number of combustion cylinders is output to the calculation control section (16).

By the way, moment fjAi! What is ability No. 1 in IB equipment?
The purpose is to raise the IL water by 25° C. per minute. Therefore, the relationship between the number (Wo), the water flow rate (Q), the set temperature (To), and the water supply temperature (Tw) is as shown in the following equation.

wo=q (To-TV) /25 Also, the combustion amount of the gas burner roughly corresponds to the number,
By switching the number of combustion gas burners (2), the number of burners can also be changed in accordance with the above switching.

In the calculation side W section (16), the set temperature (To
) The control water amount (Qo) that can be heated to Qo = 25
W/ (To-Tw) and outputs this calculated value to the servo circuit (17), while the servo circuit (17) operates the servo so that the detected water amount from the edema detection fl (6) matches the calculated input. The motor (18) is controlled to control the opening degree of the water control valve (9), that is, the amount of water flowing.

In the above configuration, when the operation switch (14) of the remote controller (month) is first turned on and then the hot water tap (10) is opened to start water flow, the setting capacity (W) is set in the arithmetic control unit (16).
The set temperature (Tx) feed water temperature (Tw) and water flow rate (Q) are input, and when the water flow rate (Q) reaches the minimum operating water flow rate in the arithmetic control section 111 (16), a signal is sent to the combustion control circuit (22). Combustion is started, and the control water 'IIk (
Q) is calculated and the water control valve (9) is controlled to adjust the amount of water flowing, and hot water is dispensed at the set temperature. In addition, if you want to vary the amount of hot water dispensed at the same hot water temperature, by switching the capacity setter (12) of the remote controller (11) to large or small, the control calculated by the calculation side W section (16) can be performed as described above. Water ffi (Q)
changes in accordance with the above switching operation, so the amount of hot water dispensed can be easily changed.

Also, as mentioned above, the gas amount is simply controlled by the capacity setting device (12
) is configured to open and close electromagnetic valves (5a) to (5e) to control the number of combustion elements in the burner element, compared to the conventional gas proportional valve system that throttles and controls the gas 1. Since there is no need to limit the throttle range, the configuration of the controller is simplified, and since an expensive gas proportional valve is not required, the instantaneous water heater can be provided at low cost.

By the way, as mentioned above, the combustion amount of the gas burner has a relationship that roughly corresponds to the number, but due to the variation in input when setting the secondary pressure and the variation in the efficiency of the heat exchanger, it is uniquely determined based on the combustion amount of the gas burner as mentioned above. Even if the setting is the same, the amount of water to be controlled will differ depending on the appliance, and the temperature at which it will emit water will also differ.

The present invention is intended to solve the above-mentioned problems, and will be specifically explained below based on an embodiment shown in the drawings. Components having the same configuration as those of the conventional example are given the same reference numerals and their explanation will be omitted.

(23) is a temperature detector installed in the water channel (24) in the middle of the heat exchanger (]). (25) is the temperature detection fl! (2
3) is a means for correcting the setting capacity based on the temperature from.

In the above configuration, the start of tapping hot water can be performed in the same manner as in the conventional example. One hour from the start of hot water dispensing (for example, the heat exchanger
(1) /Water flow rate (J!/win) r, t time), the temperature (TH) is detected from the temperature detector (23),
The correction means (25) changes the number (Wo) to Wo=Al)−
(Tn-Tw) /25 (A is a constant) Calculate using the relational expression lJ, and calculate the calculated value (to) as the above-mentioned setting ability (W)
By replacing it with , the water control valve (9) is controlled so that the control water 11 (QOI) is achieved.

In other words, if the supply water temperature (Twl is 10°C), the setting capacity (W) is No. 10, and the setting temperature (To) is bO°C, the control water 11 (QO) at the start of hot water dispensing is Qo = 10 x 25/
(601(1):=5J/+oin, and at this time, if the hot water temperature is 60'C, the number (WO) is Wo=5XL6
υ-11J)/25=10. Therefore, if the above-mentioned input variations exist and the actual number is 9.5, the outlet temperature will only be 57.5°C.

In contrast, in the present invention, the heat exchanger (
1) The temperature (TH) midway is detected, the actual number is calculated, and the amount of water is subsequently controlled based on the calculated number, so the hot water temperature can be controlled even if there are variations in input. can be done accurately.

In addition, in the present invention, the temperature detector (23) is replaced by heat exchange +t@(1)
Since it is provided midway, the time required for the above-mentioned correction can be shortened, and hot water can be dispensed at the set temperature in an extremely short period of time.

Further, if the constant A in the above equation is affected by switching the combustion layer of the gas burner (2), the value of the constant A may be changed according to the number of switching stages of the combustion amount.

As explained above, according to the present invention, the hot water temperature can be accurately controlled, the hot water taping characteristics are good, and the instant hot water FIHF is inexpensive.
i+ can be provided.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of a conventional instantaneous water heater, Fig. 2 is an electric circuit diagram of the same side unit, and Fig. 3 is an overall configuration diagram showing an embodiment of the present invention, jig41mf, l same control. FIG. (1)...Heat exchanger (2 units)...Gas burner (6)...Water amount detector (8)...Feed water temperature detector (9)...Water control valve (12)... Capacity setting device (13)...Temperature setting device (15)...iW opener (23)...Temperature detector (24)...Waterway (25)...Means patent applicant Noritz Co., Ltd. Representative Person Thick 1) Cover part 1 figure

Claims (1)

[Claims] A heat exchanger, a gas burner that heats the heat exchanger, a water control valve, a capacity setting device that varies the combustion amount of the gas burner, and the ability to set the feed water temperature from the feed water temperature detector, the set temperature, and the capacity setting device. and a controller that calculates the amount of water to be controlled based on the above, and the upper 1D water control valve is controlled by the output of the calculation, wherein a temperature detection wall is provided in the water channel in the middle of the heat exchanger, and the temperature detection A moment @ characterized by comprising means for correcting the setting ability based on the temperature from the container.
Boiling.